Three-fourths of the world's billionaire population lives in the 15 countries listed below. Collectively, the 1,942 billionaires in these countries are worth $6.8 trillion — that accounts for 79% of total global billionaire wealth in 2018.

When it comes to billionaire population, the United States dominates with 27% of the world's billionaires. Its total billionaire count rose from 2017 to 2018 by 4% to 705 billionaires. Meanwhile, total billionaire wealth worldwide decreased by 5% to slightly more than $3 trillion.

All the top Asia-Pacific countries — China, Hong Kong, India, and Singapore — saw a decrease in billionaires and billionaire wealth due to a decline in equity markets, according to the report. Meanwhile, major European countries saw both decreases and increases in billionaires, depending on economic factors.

Take a look at which countries worldwide have the most billionaires, ranked in ascending order.

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15. Singapore saw a drop in billionaires because of negative equity market performance.

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Number of billionaires: 39

Total billionaire wealth: $84 billion

Singapore is one of the richest cities in the world: The total private wealth of its residents amounts to $1 trillion, reported Business Insider's Katie Warren. It's also one of the most expensive cities to live in worldwide.

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14. Canada's wealthy are getting richer faster than the rest of the population.

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Number of billionaires: 45

Total billionaire wealth: $87 billion

Ricardo Tranjan, senior researcher at the Canadian Centre for Policy Alternatives (CCPA), ​ told CBC that "the rich are really sprinting ahead" of average Canadians. According to a CCPA report, the richest families are worth $3 billion on average and own as much wealth as three Canadian provinces combined.

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13. Italy saw a decrease in billionaire population due to political instability.

T11. The United Arab Emirates is the largest wealth market in the Middle East.

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Number of billionaires: 55

Total billionaire wealth: $165 billion

The UAE is also the 26th-largest wealth market (meaning total wealth held) worldwide, according to "The UAE 2018 Wealth Report". Dubai, which has a strong oil industry, is home to more than half of UAE's billionaires.

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T11. France's wealth has been fueled in part by corporate success in recent years.

Hong Kong has some of the most expensive real estate in the world, and the ultra-rich live in multimillion-dollar mansions, reported Business Insider's Katie Warren. The average price for a home in Hong Kong was $1.28 million in the first quarter of 2018, she said.

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6. Switzerland attracts businesses because of its technological innovation and favorable tax rates.

5. The UK's billionaires benefited from a stronger exchange rate against the US dollar.

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Number of billionaires: 97

Total billionaire wealth: $209 billion

Overall billionaire wealth in the UK declined by 16%, according to the report, partly because of weakening asset markets. London specifically, however, saw an increase in its billionaire population due to the exchange rate developments.

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4. Russia saw an increase in wealth due to the economy's recovery and higher commodity output despite volatile energy prices and geopolitical tensions.

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Number of billionaires: 102

Total billionaire wealth: $335 billion

More than half of Russia's billionaires, including the country's richest known billionaire, Leonid Mikhelson, live in Moscow.

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3. Germany is Europe's largest national economy, contributing to individual wealth accumulation.

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Number of billionaires: 146

Total billionaire wealth: $442 billion

"Germany's rich are super-rich," wrote Derek Scally for The Irish Times. Wealthy Germans tend not to flaunt their money, but treat themselves occasionally, he reported.

1. The United States is the dominant billionaire country.

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Number of billionaires: 705

Total billionaire wealth: $3.013 trillion

Billionaires in the United States have a combined net worth exceeding the total wealth among billionaires of the previous eight highest-ranked countries combined. They account for 27% of the world's billionaires and 35% of global billionaire wealth.